The effect of varied nitrogen fertilization on dynamics of soil microbiological composition and enzymatic activity of dehydrogenases under lawns

Summary.

The aim of this study was to determine the effect of increasing nitrogen fertilization of lawns (at doses corresponding to 0, 50, 100, 150 and 200 kg N per 1 ha of soil) on dynamics of changes in microbial community composition of soil: total counts of fungi, bacteria, actinomycetes, oligotrophs, copiotrophs, as well as enzymatic activity of dehydrogenases. A factor significantly modifying the microbial community composition and enzymatic activity of soil were sampling date and related atmospheric conditions. No significant effect was found of analysed levels of nitrogen fertilization on counts of microorganisms: total counts of bacteria, actinomycetes, oligotrophs, and copiotrophs. Significant effect was found of analysed levels of nitrogen fertilization on counts of fungi, as well as enzymatic activity of dehydrogenases. The quantity of total counts of bacteria, actinomycetes, oligotrophs, increased towards the beginning of the summer period (May, June), while the highest enzymatic activity of dehydrogenases was determined in September.